Sculpting tool is not working at all
To effectively use Blender's sculpting tool, you must first subdivide the object you are trying to sculpt. Sculpting moves a certain section of vertices on an object where you use the tool, so if there are no vertices to move, you cannot sculpt the object. To subdivide, go to edit mode, press 'W', and set the amount of subdivisions to be about 60 for effective sculpting.